Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.1
2.9
Journals
Atmosphere
Special Issues
Stratosphere–Troposphere Exchanges
share announcement

Stratosphere–Troposphere Exchanges

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Meteorology".

Deadline for manuscript submissions: closed (15 October 2018) | Viewed by 14114

Special Issue Editors

Dr. Jean Luc Baray

E-Mail Website
Guest Editor
Laboratoire de Météorologie Physique, UMR6016, Observatoire de Physique du Globe de Clermont-Ferrand, France
Interests: tropospheric dynamics and composition; stratosphere–troposphere exchange; LiDAR
Dr. Philippe Keckhut

E-Mail Website
Guest Editor
LATMOS-IPSL, UVSQ, UPMC, CNRS/INSU, UMR 8190, Guyancourt, France
Interests: Lidar atmosphere; organizer of the 1st International Workshop on Space-Based Lidar

Special Issue Information

Dear Colleagues,

The troposphere and the stratosphere have fundamentally different characteristics in terms of dynamical processes, static stability, and chemical composition. Air mass exchange between these two regions, and, more generally, dynamical, chemical and microphysical processes in the Upper Troposphere and Lower Stratosphere (UTLS) are of great interest in a context of climate change. The thermal structure of the tropopause layer may affect the climate system through changes of clouds, especially cirrus clouds. In the tropics, recent studies have also suggested a possible link between the tropical tropopause layer and the intensity of tropical cyclones, whose upper tropospheric dynamics can induce stratospheric updraft of water into the lower stratosphere, and also stratospheric intrusions into the troposphere.

This Special Issue calls for contributions to document themes listed below:

  1. Model experiment, dedicated instruments and observational studies of Stratosphere–Troposphere exchanges and coupling.
  2. Proposal or practice of technical improvement in model development: Backtrajectory and Lagrangian methods, Eulerian modelisation on different spatial and temporal scales.
  3. Long term trends, variability and climatology of atmospheric constituents such as water vapor, ozone, aerosols and cirrus cloud which are controlled by these coupled processes, and have important impacts on the Earth’s radiation budget.

Dr. Jean Luc Baray
Dr. Philippe Keckhut
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atmosphere is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Stratosphere–troposphere exchanges
  • Tropopause
  • TTL
  • UT/LS
  • Observation and case studies
  • Modelisation
  • Climatology and long term trends

Published Papers (4 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

19 pages, 13524 KiB  
Article
Enhanced Stratosphere/Troposphere Coupling During Extreme Warm Stratospheric Events with Strong Polar-Night Jet Oscillation
by Dieter H.W. Peters, Andrea Schneidereit and Alexey Y. Karpechko
Atmosphere 2018, 9(12), 467; https://doi.org/10.3390/atmos9120467 - 29 Nov 2018
Cited by 6 | Viewed by 4140
Abstract
Extreme warm stratospheric events during polar winters from ERA-Interim reanalysis and CMIP5-ESM-LR runs were separated by duration and strength of the polar-night jet oscillation (PJO) using a high statistical confidence level of three standard deviations (strong-PJO events). With a composite analysis, we demonstrate [...] Read more.
Extreme warm stratospheric events during polar winters from ERA-Interim reanalysis and CMIP5-ESM-LR runs were separated by duration and strength of the polar-night jet oscillation (PJO) using a high statistical confidence level of three standard deviations (strong-PJO events). With a composite analysis, we demonstrate that strong-PJO events show a significantly stronger downward propagating signal in both, northern annular mode (NAM) and zonal mean zonal wind anomaly in the stratosphere in comparison with non-PJO events. The lower stratospheric EP-flux-divergence difference in ERA-Interim was stronger in comparison to long-term CMIP5-ESM-LR runs (by a factor of four). This suggests that stratosphere–troposphere coupling is stronger in ERA-Interim than in CMIP5-ESM-LR. During the 60 days following the central date (CD), the Arctic oscillation signal was more intense during strong-PJO events than during non-PJO events in ERA-Interim data in comparison to CMIP5-ESM-LR runs. During the 15-day phase after CD, strong PJO events had a significant increase in stratospheric ozone, upper tropospheric zonally asymmetric impact, and a regional surface impact in ERA-Interim. Finally, we conclude that the applied high statistical threshold gives a clearer separation of extreme warm stratospheric events into strong-PJO events and non-PJO events including their different downward propagating NAM signal and tropospheric impacts. Full article
(This article belongs to the Special Issue Stratosphere–Troposphere Exchanges)
►▼ Show Figures

Figure 1

17 pages, 4600 KiB  
Article
An Assessment of Stratospheric Intrusions in Italian Mountain Regions Using STEFLUX
by Paolo Cristofanelli, Piero Di Carlo, Eleonora Aruffo, Francesco Apadula, Mariantonia Bencardino, Francesco D’Amore, Paolo Bonasoni and Davide Putero
Atmosphere 2018, 9(10), 413; https://doi.org/10.3390/atmos9100413 - 22 Oct 2018
Cited by 2 | Viewed by 3309
Abstract
The Mediterranean basin is considered a global hot-spot region for climate change and air quality, especially concerning summer-time ozone (O3). Previous investigations indicated that the Mediterranean basin is a preferred region for stratosphere-to-troposphere exchange (STE) and deep stratospheric intrusion (SI) events. [...] Read more.
The Mediterranean basin is considered a global hot-spot region for climate change and air quality, especially concerning summer-time ozone (O3). Previous investigations indicated that the Mediterranean basin is a preferred region for stratosphere-to-troposphere exchange (STE) and deep stratospheric intrusion (SI) events. The Lagrangian tool STEFLUX, based on a STE climatology that uses the ERA Interim data, was hereby used to diagnose the occurrence of deep SI events in four mountain regions over the Italian peninsula, spanning from the Alpine region to the southern Apennines. By using near-surface O3 and relative humidity (RH) observations at three high-mountain observatories, we investigated the performance of STEFLUX in detecting deep SI events. Both experimental and STEFLUX detections agreed in describing the seasonal cycle of SI occurrence. Moreover, STEFLUX showed skills in detecting “long-lasting” SI events, especially in the Alps and in the northern Apennines. By using STEFLUX, we found positive tendencies in the SI occurrence during 1979–2017. However, in contrast to similar studies carried out in the Alpine region, the negative long-term (1996–2016) trend of O3 in the northern Apennines did not appear to be related to the SI’s variability. Full article
(This article belongs to the Special Issue Stratosphere–Troposphere Exchanges)
►▼ Show Figures

Figure 1

17 pages, 5919 KiB  
Article
Upper Tropospheric Water Vapor Transport from Indian to Sahelian Regions
by Abdoulaye Sy, Bouya Diop, Joël Van Baelen, Christophe Duroure, Yahya Gour and Jean-Luc Baray
Atmosphere 2018, 9(10), 403; https://doi.org/10.3390/atmos9100403 - 16 Oct 2018
Cited by 3 | Viewed by 3114
Abstract
We present a study of upper tropospheric westward transport of air masses coming from the Indian monsoon zone over the period 1998–2008. The objective is to characterize upper tropospheric transport of water vapor from the Indian to Sahelian regions, and to improve the [...] Read more.
We present a study of upper tropospheric westward transport of air masses coming from the Indian monsoon zone over the period 1998–2008. The objective is to characterize upper tropospheric transport of water vapor from the Indian to Sahelian regions, and to improve the understanding of the dynamical mechanisms that govern water vapor variations in West Africa and the interconnections between India and the Sahel, focusing on the direct role of the Indian monsoon region on Sahel tropospheric water vapor and precipitation. The calculations of forward trajectories with LACYTRAJ (LACY TRAJectory code) and humidity fluxes show that a substantial part (40 to 70% at 300 hPa) of trajectories coming from the upper troposphere of the monsoon region crossed the Sahelian region in a few days (3–14 days), and water vapor fluxes connecting these two regions are established when the Indian monsoon begins at latitudes higher than 15° N in its south–north migration. The intensity and orientation of water vapor fluxes are related to the tropical easterly jet, but they are from the east above the high convection zones. Between 1998 and 2008, these fluxes between the 500–300 hPa pressure levels are associated with precipitation in Sahel only if they are from the east and with an intensity exceeding 8 kg·(m·s)−1. Full article
(This article belongs to the Special Issue Stratosphere–Troposphere Exchanges)
►▼ Show Figures

Figure 1

14 pages, 4879 KiB  
Article
Long-Range Transport of Water Channelized through the Southern Subtropical Jet
by Eliane G. Larroza, Philippe Keckhut, Jean-Luc Baray, Walter M. Nakaema, Hélène Vérèmes, Eduardo Landulfo, Davide Dionisi, Sergey Khaykin and François Ravetta
Atmosphere 2018, 9(10), 374; https://doi.org/10.3390/atmos9100374 - 25 Sep 2018
Cited by 1 | Viewed by 2736
Abstract
In this study, an air mass (containing a cirrus cloud) was detected by light detection and ranging (lidar) above São Paulo (Brazil) in June 2007 and tracked around the globe, thanks to Lagrangian calculations as well as ground-based and satellite observations. Cloud-Aerosol Lidar [...] Read more.
In this study, an air mass (containing a cirrus cloud) was detected by light detection and ranging (lidar) above São Paulo (Brazil) in June 2007 and tracked around the globe, thanks to Lagrangian calculations as well as ground-based and satellite observations. Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data were also used to provide locations of occurrence of cirrus around the globe and extract their respective macro physical parameters (altitude and temperature). An analysis of the air mass history based on Lagrangian trajectories reveals that water coming from the Equator is channelized through the southern subtropical jet for weeks. In this case, the back-trajectories showed that the cirrus cloud detected at São Paulo was a mixture of air masses from two different locations: (1) the active convective area located around the Equator, with transport into the upper troposphere that promotes cirrus cloud formation; and (2) the South Pacific Ocean, with transport that follows the subtropical jet stream (STJ). Air masses coming from equatorial convective regions are trapped by the jet, which contributes to maintaining the lifetime of the cirrus cloud for a few days. The cloud disappears near the African continent, due to a southern excursion and warmer temperatures, then reappears and is detected again by the lidar system in São Paulo after 12 days. The observed cloud is located at a similar altitude, revealing that sedimentation is small or compensated by radiative uplift. Full article
(This article belongs to the Special Issue Stratosphere–Troposphere Exchanges)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-4
Back to TopTop